#include<stdio.h>
int main()
{
	int a = 1;
	int b = 2;
	switch (a)
	{
	case1: a++;
	case2: b++;	
	case3:
		switch (a)
	    {
		case4:a++;
		case5:b++; a++;
			break;
	    }
	case6:b++;
		break;
	default:
		break;
	}
	printf("a=%d b=%d\n", a, b);
	return 0;
}